Convert Celsius to Kelvin
0 °C is 273.15 K. To convert degrees Celsius to kelvins, add 273.15: for example, 20 °C is 293.15 K. Ethical Tube's free Celsius to Kelvin converter does the math as you type, and the chart below lists common values.
1 °C = 274.15 K
- 0 °C
- 273.15 K
- 100 °C
- 373.15 K
- Formula
- K = °C + 273.15
- Measures
- Temperature
- Price
- Free
- Works offline
- Yes
Conversion chart
Celsius to Kelvin chart
| Degrees Celsius (°C) | Kelvins (K) |
|---|---|
| -40 °C | 233.15 K |
| -20 °C | 253.15 K |
| -10 °C | 263.15 K |
| 0 °C | 273.15 K |
| 10 °C | 283.15 K |
| 20 °C | 293.15 K |
| 25 °C | 298.15 K |
| 30 °C | 303.15 K |
| 37 °C | 310.15 K |
| 40 °C | 313.15 K |
| 50 °C | 323.15 K |
| 100 °C | 373.15 K |
How it works
How to convert Celsius to Kelvin
Know the formula
K = °C + 273.15. In words: add 273.15.
Work an example
20 °C → 293.15 K. Round to two or three decimal places for everyday use.
Or type it in
Enter any value in the converter above and the answer appears instantly, in both directions.
Good to know
About temperature units
- Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level.
- Kelvin starts at absolute zero, −273.15 °C, and uses the same step size as Celsius. It's written without a degree sign.
- −40 is the same temperature in Celsius and Fahrenheit.
FAQ
Questions, answered
How do you convert Celsius to Kelvin?
To convert degrees Celsius to kelvins, add 273.15. The formula is K = °C + 273.15. For example, 20 °C is 293.15 K.
What is 20 Celsius in Kelvin?
20 degrees Celsius is 293.15 kelvins.
What is the formula for Celsius to Kelvin?
K = °C + 273.15. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level.
Is this Celsius to Kelvin converter free?
Yes. It's free and works in any browser, even offline once the page has loaded. The answer updates as you type, and nothing you enter is sent anywhere.
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